This Truck-Sized Pregnant Fish May Have Just Broken A World Record

Conservationist Jeff Corwin documented the catch of the giant freshwater stingray - reeling in what he called the largest fish ever caught on a rod and reel (she was tagged for research to help her species and released).

Caught on the Mae Klong river in Thailand, the ray was 8 feet wide and 14 feet long and estimated to weigh about 800 pounds.

"It's really hard to weigh these things without hurting them, because they are such big, awkward animals," he said, according to National Geographic.

An ultrasound revealed that the stingray was pregnant with two fetal rays, National Geographic reports. And the same ray was caught and tagged in 2009, when she was also pregnant. Hogan said that means the area is likely a "nursery ground."

That's good news for Thailand's giant freshwater stingrays, a group listed as critically endangered by the International Union for the Conservation of Nature. Threatened by overfishing, habitat degradation and contamination from pollution and oil spills, the species has been in dire straits recently.

Right now, the Guinness Book of World Records lists the Mekong giant catfish as the world's largest freshwater fish at 660 pounds - a listing that might be changing very soon.